Nellie is considered as a nickname for Helen & Ellen. I have the 1860 census sheet from Richmond, McHenry County, Illinois pg 1/35. It shows william, Polly & 5 children: Edward, George, William, Charles, & Ellen. He's from England & the rest are from New York.
I would like better birth info on Ellen & any info on Polly.Also any immigration data on William would be helpful.
I have solid info on Nellie's (Ellen's) son Frank if you need it.
BTW: what other lines are you looking for? Maybe I can help.